1 /*- 2 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 static char copyright[] = 36 "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94"; 43 #endif 44 static const char rcsid[] = 45 "$Id$"; 46 #endif /* not lint */ 47 48 /* 49 * login [ name ] 50 * login -h hostname (for telnetd, etc.) 51 * login -f name (for pre-authenticated login: datakit, xterm, etc.) 52 */ 53 54 #include <sys/copyright.h> 55 #include <sys/param.h> 56 #include <sys/stat.h> 57 #include <sys/time.h> 58 #include <sys/resource.h> 59 #include <sys/file.h> 60 #include <netinet/in.h> 61 #include <arpa/inet.h> 62 63 #include <err.h> 64 #include <errno.h> 65 #include <grp.h> 66 #include <netdb.h> 67 #include <pwd.h> 68 #include <setjmp.h> 69 #include <signal.h> 70 #include <stdio.h> 71 #include <stdlib.h> 72 #include <string.h> 73 #include <syslog.h> 74 #include <ttyent.h> 75 #include <unistd.h> 76 #include <utmp.h> 77 78 #ifdef LOGIN_CAP 79 #include <login_cap.h> 80 #else /* Undef AUTH as well */ 81 #undef LOGIN_CAP_AUTH 82 #endif 83 84 /* 85 * If LOGIN_CAP_AUTH is activated: 86 * kerberose & skey logins are runtime selected via login 87 * login_getstyle() and authentication types for login classes 88 * The actual login itself is handled via /usr/libexec/login_<style> 89 * Valid styles are determined by the auth-type=style,style entries 90 * in the login class. 91 */ 92 #ifdef LOGIN_CAP_AUTH 93 #undef KERBEROS 94 #undef SKEY 95 #endif /* LOGIN_CAP_AUTH */ 96 97 #ifdef SKEY 98 #include <skey.h> 99 #endif /* SKEY */ 100 101 #include "pathnames.h" 102 103 void badlogin __P((char *)); 104 void checknologin __P((void)); 105 void dolastlog __P((int)); 106 void getloginname __P((void)); 107 void motd __P((char *)); 108 int rootterm __P((char *)); 109 void sigint __P((int)); 110 void sleepexit __P((int)); 111 void refused __P((char *,char *,int)); 112 char *stypeof __P((char *)); 113 void timedout __P((int)); 114 void login_fbtab __P((char *, uid_t, gid_t)); 115 #ifdef KERBEROS 116 int klogin __P((struct passwd *, char *, char *, char *)); 117 #endif 118 119 extern void login __P((struct utmp *)); 120 static void usage __P((void)); 121 122 #define TTYGRPNAME "tty" /* name of group to own ttys */ 123 #define DEFAULT_BACKOFF 3 124 #define DEFAULT_RETRIES 10 125 126 /* 127 * This bounds the time given to login. Not a define so it can 128 * be patched on machines where it's too small. 129 */ 130 u_int timeout = 300; 131 132 #ifdef KERBEROS 133 int notickets = 1; 134 int noticketsdontcomplain = 1; 135 char *instance; 136 char *krbtkfile_env; 137 int authok; 138 #endif 139 140 struct passwd *pwd; 141 int failures; 142 char *term, *envinit[1], *hostname, *username, *tty; 143 char full_hostname[MAXHOSTNAMELEN]; 144 145 int 146 main(argc, argv) 147 int argc; 148 char *argv[]; 149 { 150 extern char **environ; 151 struct group *gr; 152 struct stat st; 153 struct timeval tp; 154 struct utmp utmp; 155 int rootok, retries, backoff; 156 int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval; 157 int changepass; 158 time_t warntime; 159 uid_t uid; 160 char *domain, *p, *ep, *salt, *ttyn; 161 char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10]; 162 char localhost[MAXHOSTNAMELEN]; 163 char *shell = NULL; 164 #ifdef LOGIN_CAP 165 login_cap_t *lc = NULL; 166 #ifdef LOGIN_CAP_AUTH 167 char *style, *authtype; 168 char *auth_method = NULL; 169 char *instance = NULL; 170 int authok; 171 #endif /* LOGIN_CAP_AUTH */ 172 #endif /* LOGIN_CAP */ 173 #ifdef SKEY 174 int permit_passwd = 0; 175 #endif /* SKEY */ 176 177 (void)signal(SIGALRM, timedout); 178 (void)alarm(timeout); 179 (void)signal(SIGQUIT, SIG_IGN); 180 (void)signal(SIGINT, SIG_IGN); 181 (void)setpriority(PRIO_PROCESS, 0, 0); 182 183 openlog("login", LOG_ODELAY, LOG_AUTH); 184 185 /* 186 * -p is used by getty to tell login not to destroy the environment 187 * -f is used to skip a second login authentication 188 * -h is used by other servers to pass the name of the remote 189 * host to login so that it may be placed in utmp and wtmp 190 */ 191 *full_hostname = '\0'; 192 domain = NULL; 193 term = NULL; 194 if (gethostname(localhost, sizeof(localhost)) < 0) 195 syslog(LOG_ERR, "couldn't get local hostname: %m"); 196 else 197 domain = strchr(localhost, '.'); 198 199 fflag = hflag = pflag = 0; 200 uid = getuid(); 201 while ((ch = getopt(argc, argv, "fh:p")) != -1) 202 switch (ch) { 203 case 'f': 204 fflag = 1; 205 break; 206 case 'h': 207 if (uid) 208 errx(1, "-h option: %s", strerror(EPERM)); 209 hflag = 1; 210 strncpy(full_hostname, optarg, sizeof(full_hostname)-1); 211 if (domain && (p = strchr(optarg, '.')) && 212 strcasecmp(p, domain) == 0) 213 *p = 0; 214 if (strlen(optarg) > UT_HOSTSIZE) { 215 struct hostent *hp = gethostbyname(optarg); 216 217 if (hp != NULL) { 218 struct in_addr in; 219 220 memmove(&in, hp->h_addr, sizeof(in)); 221 optarg = strdup(inet_ntoa(in)); 222 } else 223 optarg = "invalid hostname"; 224 } 225 hostname = optarg; 226 break; 227 case 'p': 228 pflag = 1; 229 break; 230 case '?': 231 default: 232 if (!uid) 233 syslog(LOG_ERR, "invalid flag %c", ch); 234 usage(); 235 } 236 argc -= optind; 237 argv += optind; 238 239 if (*argv) { 240 username = *argv; 241 ask = 0; 242 } else 243 ask = 1; 244 245 for (cnt = getdtablesize(); cnt > 2; cnt--) 246 (void)close(cnt); 247 248 ttyn = ttyname(STDIN_FILENO); 249 if (ttyn == NULL || *ttyn == '\0') { 250 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); 251 ttyn = tname; 252 } 253 if ((tty = strrchr(ttyn, '/')) != NULL) 254 ++tty; 255 else 256 tty = ttyn; 257 258 #ifdef LOGIN_CAP_AUTH 259 authtype = hostname ? "rlogin" : "login"; 260 #endif 261 #ifdef LOGIN_CAP 262 /* 263 * Get "login-retries" & "login-backoff" from default class 264 */ 265 lc = login_getclass(NULL); 266 retries = login_getcapnum(lc, "login-retries", DEFAULT_RETRIES, DEFAULT_RETRIES); 267 backoff = login_getcapnum(lc, "login-backoff", DEFAULT_BACKOFF, DEFAULT_BACKOFF); 268 login_close(lc); 269 lc = NULL; 270 #else 271 retries = DEFAULT_RETRIES; 272 backoff = DEFAULT_BACKOFF; 273 #endif 274 275 for (cnt = 0;; ask = 1) { 276 if (ask) { 277 fflag = 0; 278 getloginname(); 279 } 280 rootlogin = 0; 281 rootok = rootterm(tty); /* Default (auth may change) */ 282 #ifdef LOGIN_CAP_AUTH 283 authok = 0; 284 if (auth_method = strchr(username, ':')) { 285 *auth_method = '\0'; 286 auth_method++; 287 if (*auth_method == '\0') 288 auth_method = NULL; 289 } 290 /* 291 * We need to do this regardless of whether 292 * kerberos is available. 293 */ 294 if ((instance = strchr(username, '.')) != NULL) { 295 if (strncmp(instance, ".root", 5) == 0) 296 rootlogin = 1; 297 *instance++ = '\0'; 298 } else 299 instance = ""; 300 #else /* !LOGIN_CAP_AUTH */ 301 #ifdef KERBEROS 302 if ((instance = strchr(username, '.')) != NULL) { 303 if (strncmp(instance, ".root", 5) == 0) 304 rootlogin = 1; 305 *instance++ = '\0'; 306 } else 307 instance = ""; 308 #endif /* KERBEROS */ 309 #endif /* LOGIN_CAP_AUTH */ 310 311 if (strlen(username) > UT_NAMESIZE) 312 username[UT_NAMESIZE] = '\0'; 313 314 /* 315 * Note if trying multiple user names; log failures for 316 * previous user name, but don't bother logging one failure 317 * for nonexistent name (mistyped username). 318 */ 319 if (failures && strcmp(tbuf, username)) { 320 if (failures > (pwd ? 0 : 1)) 321 badlogin(tbuf); 322 failures = 0; 323 } 324 (void)strncpy(tbuf, username, sizeof tbuf-1); 325 tbuf[sizeof tbuf-1] = '\0'; 326 327 if ((pwd = getpwnam(username)) != NULL) 328 salt = pwd->pw_passwd; 329 else 330 salt = "xx"; 331 332 #ifdef LOGIN_CAP 333 /* 334 * Establish the class now, before we might goto 335 * within the next block. pwd can be NULL since it 336 * falls back to the "default" class if it is. 337 */ 338 lc = login_getpwclass(pwd); 339 #endif /* LOGIN_CAP */ 340 341 /* 342 * if we have a valid account name, and it doesn't have a 343 * password, or the -f option was specified and the caller 344 * is root or the caller isn't changing their uid, don't 345 * authenticate. 346 */ 347 rval = 1; 348 if (pwd != NULL) { 349 if (pwd->pw_uid == 0) 350 rootlogin = 1; 351 352 if (fflag && (uid == (uid_t)0 || 353 uid == (uid_t)pwd->pw_uid)) { 354 /* already authenticated */ 355 break; 356 } else if (pwd->pw_passwd[0] == '\0') { 357 if (!rootlogin || rootok) { 358 /* pretend password okay */ 359 rval = 0; 360 goto ttycheck; 361 } 362 } 363 } 364 365 fflag = 0; 366 367 (void)setpriority(PRIO_PROCESS, 0, -4); 368 369 #ifdef LOGIN_CAP_AUTH 370 /* 371 * This hands off authorization to an authorization program, 372 * depending on the styles available for the "auth-login", 373 * auth-rlogin (or default) authorization styles. 374 * We do this regardless of whether an account exists so that 375 * the remote user cannot tell a "real" from an invented 376 * account name. If we don't have an account we just fall 377 * back to the first method for the "default" class. 378 */ 379 if (!(style = login_getstyle(lc, auth_method, authtype))) { 380 381 /* 382 * No available authorization method 383 */ 384 rval = 1; 385 (void)printf("No auth method available for %s.\n", 386 authtype); 387 } else { 388 389 /* 390 * Put back the kerberos instance, if any was given. 391 * Don't worry about the non-kerberos case here, since 392 * if kerberos is not available or not selected and an 393 * instance is given at the login prompt, su or rlogin -l, 394 * then anything else should fail as well. 395 */ 396 if (*instance) 397 *(instance - 1) = '.'; 398 399 rval = authenticate(username, 400 lc ? lc->lc_class : "default", 401 style, authtype); 402 /* Junk it again */ 403 if (*instance) 404 *(instance - 1) = '\0'; 405 } 406 407 if (!rval) { 408 char * approvp; 409 410 /* 411 * If authentication succeeds, run any approval 412 * program, if applicable for this class. 413 */ 414 approvep = login_getcapstr(lc, "approve", NULL, NULL); 415 rval = 1; /* Assume bad login again */ 416 417 if (approvep==NULL || 418 auth_script(approvep, approvep, username, 419 lc->lc_class, 0) == 0) { 420 int r; 421 422 r = auth_scan(AUTH_OKAY); 423 /* 424 * See what the authorize program says 425 */ 426 if (r != AUTH_NONE) { 427 rval = 0; 428 429 if (!rootok && (r & AUTH_ROOTOKAY)) 430 rootok = 1; /* root approved */ 431 else 432 rootlogin = 0; 433 434 if (!authok && (r & AUTH_SECURE)) 435 authok = 1; /* secure */ 436 } 437 } 438 } 439 #else /* !LOGIN_CAP_AUTH */ 440 #ifdef SKEY 441 permit_passwd = skeyaccess(username, tty, 442 hostname ? full_hostname : NULL, 443 NULL); 444 p = skey_getpass("Password:", pwd, permit_passwd); 445 ep = skey_crypt(p, salt, pwd, permit_passwd); 446 #else /* !SKEY */ 447 p = getpass("Password:"); 448 ep = crypt(p, salt); 449 #endif/* SKEY */ 450 451 if (pwd) { 452 #ifdef KERBEROS 453 #ifdef SKEY 454 /* 455 * Do not allow user to type in kerberos password 456 * over the net (actually, this is ok for encrypted 457 * links, but we have no way of determining if the 458 * link is encrypted. 459 */ 460 if (!permit_passwd) { 461 rval = 1; /* failed */ 462 } else 463 #endif /* SKEY */ 464 rval = klogin(pwd, instance, localhost, p); 465 if (rval != 0 && rootlogin && pwd->pw_uid != 0) 466 rootlogin = 0; 467 if (rval == 0) 468 authok = 1; /* kerberos authenticated ok */ 469 else if (rval == 1) /* fallback to unix passwd */ 470 rval = strcmp(ep, pwd->pw_passwd); 471 #else /* !KERBEROS */ 472 rval = strcmp(ep, pwd->pw_passwd); 473 #endif /* KERBEROS */ 474 } 475 476 /* clear entered password */ 477 memset(p, 0, strlen(p)); 478 #endif /* LOGIN_CAP_AUTH */ 479 480 (void)setpriority(PRIO_PROCESS, 0, 0); 481 482 #ifdef LOGIN_CAP_AUTH 483 if (rval) 484 auth_rmfiles(); 485 #endif 486 ttycheck: 487 /* 488 * If trying to log in as root without Kerberos, 489 * but with insecure terminal, refuse the login attempt. 490 */ 491 if (pwd && !rval) { 492 #if defined(KERBEROS) || defined(LOGIN_CAP_AUTH) 493 if (authok == 0 && rootlogin && !rootok) 494 #else 495 if (rootlogin && !rootok) 496 #endif 497 refused(NULL, "NOROOT", 0); 498 else /* valid password & authenticated */ 499 break; 500 } 501 502 (void)printf("Login incorrect\n"); 503 failures++; 504 505 /* 506 * we allow up to 'retry' (10) tries, 507 * but after 'backoff' (3) we start backing off 508 */ 509 if (++cnt > backoff) { 510 if (cnt >= retries) { 511 badlogin(username); 512 sleepexit(1); 513 } 514 sleep((u_int)((cnt - 3) * 5)); 515 } 516 } 517 518 /* committed to login -- turn off timeout */ 519 (void)alarm((u_int)0); 520 521 endpwent(); 522 523 /* if user not super-user, check for disabled logins */ 524 #ifdef LOGIN_CAP 525 if (!rootlogin) 526 auth_checknologin(lc); 527 #else 528 if (!rootlogin) 529 checknologin(); 530 #endif 531 532 #ifdef LOGIN_CAP 533 quietlog = login_getcapbool(lc, "hushlogin", 0); 534 #else 535 quietlog = 0; 536 #endif 537 if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) { 538 #ifdef LOGIN_CAP 539 if (login_getcapbool(lc, "requirehome", 0)) 540 refused("Home directory not available", "HOMEDIR", 1); 541 #endif 542 if (chdir("/") < 0) 543 refused("Cannot find root directory", "ROOTDIR", 1); 544 pwd->pw_dir = "/"; 545 if (!quietlog || *pwd->pw_dir) 546 printf("No home directory.\nLogging in with home = \"/\".\n"); 547 } 548 if (!quietlog) 549 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 550 551 if (pwd->pw_change || pwd->pw_expire) 552 (void)gettimeofday(&tp, (struct timezone *)NULL); 553 554 #define DEFAULT_WARN (2L * 7L & 86400L) /* Two weeks */ 555 556 #ifdef LOGIN_CAP 557 warntime = login_getcaptime(lc, "warnpassword", 558 DEFAULT_WARN, DEFAULT_WARN); 559 #else 560 warntime = DEFAULT_WARN; 561 #endif 562 563 changepass=0; 564 if (pwd->pw_change) { 565 if (tp.tv_sec >= pwd->pw_change) { 566 (void)printf("Sorry -- your password has expired.\n"); 567 changepass=1; 568 syslog(LOG_INFO, 569 "%s Password expired - forcing change", 570 pwd->pw_name); 571 } else if (pwd->pw_change - tp.tv_sec < warntime && !quietlog) 572 (void)printf("Warning: your password expires on %s", 573 ctime(&pwd->pw_change)); 574 } 575 576 #ifdef LOGIN_CAP 577 warntime = login_getcaptime(lc, "warnexpire", 578 DEFAULT_WARN, DEFAULT_WARN); 579 #else 580 warntime = DEFAULT_WARN; 581 #endif 582 583 if (pwd->pw_expire) { 584 if (tp.tv_sec >= pwd->pw_expire) { 585 refused("Sorry -- your account has expired", 586 "EXPIRED", 1); 587 } else if (pwd->pw_expire - tp.tv_sec < warntime && !quietlog) 588 (void)printf("Warning: your account expires on %s", 589 ctime(&pwd->pw_expire)); 590 } 591 592 #ifdef LOGIN_CAP 593 if (lc != NULL) { 594 if (hostname) { 595 struct hostent *hp = gethostbyname(full_hostname); 596 597 if (hp == NULL) 598 optarg = NULL; 599 else { 600 struct in_addr in; 601 memmove(&in, hp->h_addr, sizeof(in)); 602 optarg = strdup(inet_ntoa(in)); 603 } 604 if (!auth_hostok(lc, full_hostname, optarg)) 605 refused("Permission denied", "HOST", 1); 606 } 607 608 if (!auth_ttyok(lc, tty)) 609 refused("Permission denied", "TTY", 1); 610 611 if (!auth_timeok(lc, time(NULL))) 612 refused("Logins not available right now", "TIME", 1); 613 } 614 shell=login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); 615 #else /* !LOGIN_CAP */ 616 shell=pwd->pw_shell; 617 #endif /* LOGIN_CAP */ 618 if (*pwd->pw_shell == '\0') 619 pwd->pw_shell = _PATH_BSHELL; 620 if (*shell == '\0') /* Not overridden */ 621 shell = pwd->pw_shell; 622 if ((shell = strdup(shell)) == NULL) { 623 syslog(LOG_NOTICE, "memory allocation error"); 624 sleepexit(1); 625 } 626 627 #ifdef LOGIN_ACCESS 628 if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0) 629 refused("Permission denied", "ACCESS", 1); 630 #endif /* LOGIN_ACCESS */ 631 632 /* Nothing else left to fail -- really log in. */ 633 memset((void *)&utmp, 0, sizeof(utmp)); 634 (void)time(&utmp.ut_time); 635 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 636 if (hostname) 637 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 638 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 639 login(&utmp); 640 641 dolastlog(quietlog); 642 643 /* 644 * Set device protections, depending on what terminal the 645 * user is logged in. This feature is used on Suns to give 646 * console users better privacy. 647 */ 648 login_fbtab(tty, pwd->pw_uid, pwd->pw_gid); 649 650 (void)chown(ttyn, pwd->pw_uid, 651 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); 652 653 /* 654 * Preserve TERM if it happens to be already set. 655 */ 656 if ((term = getenv("TERM")) != NULL) 657 term = strdup(term); 658 659 /* 660 * Exclude cons/vt/ptys only, assume dialup otherwise 661 * TODO: Make dialup tty determination a library call 662 * for consistency (finger etc.) 663 */ 664 if (hostname==NULL && isdialuptty(tty)) 665 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 666 667 #ifdef KERBEROS 668 if (!quietlog && notickets == 1 && !noticketsdontcomplain) 669 (void)printf("Warning: no Kerberos tickets issued.\n"); 670 #endif 671 672 #ifdef LOGALL 673 /* 674 * Syslog each successful login, so we don't have to watch hundreds 675 * of wtmp or lastlogin files. 676 */ 677 if (hostname) 678 syslog(LOG_INFO, "login from %s on %s as %s", 679 full_hostname, tty, pwd->pw_name); 680 else 681 syslog(LOG_INFO, "login on %s as %s", 682 tty, pwd->pw_name); 683 #endif 684 685 /* 686 * If fflag is on, assume caller/authenticator has logged root login. 687 */ 688 if (rootlogin && fflag == 0) 689 { 690 if (hostname) 691 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 692 username, tty, full_hostname); 693 else 694 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 695 username, tty); 696 } 697 698 /* 699 * Destroy environment unless user has requested its preservation. 700 * We need to do this before setusercontext() because that may 701 * set or reset some environment variables. 702 */ 703 if (!pflag) 704 environ = envinit; 705 706 /* 707 * We don't need to be root anymore, so 708 * set the user and session context 709 */ 710 #ifdef LOGIN_CAP 711 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL) != 0) { 712 syslog(LOG_ERR, "setusercontext() failed - exiting"); 713 exit(1); 714 } 715 #else 716 if (setlogin(pwd->pw_name) < 0) 717 syslog(LOG_ERR, "setlogin() failure: %m"); 718 719 (void)setgid(pwd->pw_gid); 720 initgroups(username, pwd->pw_gid); 721 (void)setuid(rootlogin ? 0 : pwd->pw_uid); 722 #endif 723 724 (void)setenv("SHELL", pwd->pw_shell, 1); 725 (void)setenv("HOME", pwd->pw_dir, 1); 726 if (term != NULL && *term != '\0') 727 (void)setenv("TERM", term, 1); /* Preset overrides */ 728 else { 729 (void)setenv("TERM", stypeof(tty), 0); /* Fallback doesn't */ 730 } 731 (void)setenv("LOGNAME", pwd->pw_name, 1); 732 (void)setenv("USER", pwd->pw_name, 1); 733 (void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0); 734 #ifdef KERBEROS 735 if (krbtkfile_env) 736 (void)setenv("KRBTKFILE", krbtkfile_env, 1); 737 #endif 738 #if LOGIN_CAP_AUTH 739 auth_env(); 740 #endif 741 742 #ifdef LOGIN_CAP 743 if (!quietlog) { 744 char *cw; 745 746 cw = login_getcapstr(lc, "copyright", NULL, NULL); 747 if (cw != NULL && access(cw, F_OK) == 0) 748 motd(cw); 749 else 750 (void)printf("%s\n\t%s %s\n", 751 "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", 752 "The Regents of the University of California. ", 753 "All rights reserved."); 754 755 (void)printf("\n"); 756 757 cw = login_getcapstr(lc, "welcome", NULL, NULL); 758 if (cw == NULL || access(cw, F_OK) != 0) 759 cw = _PATH_MOTDFILE; 760 motd(cw); 761 762 cw = getenv("MAIL"); /* $MAIL may have been set by class */ 763 if (cw != NULL) { 764 strncpy(tbuf, cw, sizeof(tbuf)); 765 tbuf[sizeof(tbuf)-1] = '\0'; 766 } else 767 snprintf(tbuf, sizeof(tbuf), "%s/%s", 768 _PATH_MAILDIR, pwd->pw_name); 769 #else 770 if (!quietlog) { 771 (void)printf("%s\n\t%s %s\n", 772 "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", 773 "The Regents of the University of California. ", 774 "All rights reserved."); 775 motd(_PATH_MOTDFILE); 776 snprintf(tbuf, sizeof(tbuf), "%s/%s", 777 _PATH_MAILDIR, pwd->pw_name); 778 #endif 779 if (stat(tbuf, &st) == 0 && st.st_size != 0) 780 (void)printf("You have %smail.\n", 781 (st.st_mtime > st.st_atime) ? "new " : ""); 782 } 783 784 #ifdef LOGIN_CAP 785 login_close(lc); 786 #endif 787 788 (void)signal(SIGALRM, SIG_DFL); 789 (void)signal(SIGQUIT, SIG_DFL); 790 (void)signal(SIGINT, SIG_DFL); 791 (void)signal(SIGTSTP, SIG_IGN); 792 793 if (changepass) { 794 if (system(_PATH_CHPASS) != 0) 795 sleepexit(1); 796 } 797 798 /* 799 * Login shells have a leading '-' in front of argv[0] 800 */ 801 tbuf[0] = '-'; 802 (void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell); 803 804 execlp(shell, tbuf, 0); 805 err(1, "%s", shell); 806 } 807 808 static void 809 usage() 810 { 811 (void)fprintf(stderr, "usage: login [-fp] [-h hostname] [username]\n"); 812 exit(1); 813 } 814 815 /* 816 * Allow for authentication style and/or kerberos instance 817 * */ 818 819 #define NBUFSIZ UT_NAMESIZE + 64 820 821 void 822 getloginname() 823 { 824 int ch; 825 char *p; 826 static char nbuf[NBUFSIZ]; 827 828 for (;;) { 829 (void)printf("login: "); 830 for (p = nbuf; (ch = getchar()) != '\n'; ) { 831 if (ch == EOF) { 832 badlogin(username); 833 exit(0); 834 } 835 if (p < nbuf + (NBUFSIZ - 1)) 836 *p++ = ch; 837 } 838 if (p > nbuf) 839 if (nbuf[0] == '-') 840 (void)fprintf(stderr, 841 "login names may not start with '-'.\n"); 842 else { 843 *p = '\0'; 844 username = nbuf; 845 break; 846 } 847 } 848 } 849 850 int 851 rootterm(ttyn) 852 char *ttyn; 853 { 854 struct ttyent *t; 855 856 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 857 } 858 859 volatile int motdinterrupt; 860 861 /* ARGSUSED */ 862 void 863 sigint(signo) 864 int signo; 865 { 866 motdinterrupt = 1; 867 } 868 869 void 870 motd(motdfile) 871 char *motdfile; 872 { 873 int fd, nchars; 874 sig_t oldint; 875 char tbuf[256]; 876 877 if ((fd = open(motdfile, O_RDONLY, 0)) < 0) 878 return; 879 motdinterrupt = 0; 880 oldint = signal(SIGINT, sigint); 881 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 && !motdinterrupt) 882 (void)write(fileno(stdout), tbuf, nchars); 883 (void)signal(SIGINT, oldint); 884 (void)close(fd); 885 } 886 887 /* ARGSUSED */ 888 void 889 timedout(signo) 890 int signo; 891 { 892 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 893 exit(0); 894 } 895 896 #ifndef LOGIN_CAP 897 void 898 checknologin() 899 { 900 int fd, nchars; 901 char tbuf[8192]; 902 903 if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) { 904 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 905 (void)write(fileno(stdout), tbuf, nchars); 906 sleepexit(0); 907 } 908 } 909 #endif 910 911 void 912 dolastlog(quiet) 913 int quiet; 914 { 915 struct lastlog ll; 916 int fd; 917 918 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) { 919 (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET); 920 if (!quiet) { 921 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 922 ll.ll_time != 0) { 923 (void)printf("Last login: %.*s ", 924 24-5, (char *)ctime(&ll.ll_time)); 925 if (*ll.ll_host != '\0') 926 (void)printf("from %.*s\n", 927 (int)sizeof(ll.ll_host), 928 ll.ll_host); 929 else 930 (void)printf("on %.*s\n", 931 (int)sizeof(ll.ll_line), 932 ll.ll_line); 933 } 934 (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET); 935 } 936 memset((void *)&ll, 0, sizeof(ll)); 937 (void)time(&ll.ll_time); 938 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 939 if (hostname) 940 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 941 (void)write(fd, (char *)&ll, sizeof(ll)); 942 (void)close(fd); 943 } 944 } 945 946 void 947 badlogin(name) 948 char *name; 949 { 950 951 if (failures == 0) 952 return; 953 if (hostname) { 954 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 955 failures, failures > 1 ? "S" : "", full_hostname); 956 syslog(LOG_AUTHPRIV|LOG_NOTICE, 957 "%d LOGIN FAILURE%s FROM %s, %s", 958 failures, failures > 1 ? "S" : "", full_hostname, name); 959 } else { 960 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 961 failures, failures > 1 ? "S" : "", tty); 962 syslog(LOG_AUTHPRIV|LOG_NOTICE, 963 "%d LOGIN FAILURE%s ON %s, %s", 964 failures, failures > 1 ? "S" : "", tty, name); 965 } 966 } 967 968 #undef UNKNOWN 969 #define UNKNOWN "su" 970 971 char * 972 stypeof(ttyid) 973 char *ttyid; 974 { 975 976 struct ttyent *t; 977 978 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN); 979 } 980 981 void 982 refused(msg, rtype, lout) 983 char *msg; 984 char *rtype; 985 int lout; 986 { 987 988 if (msg != NULL) 989 printf("%s.\n", msg); 990 if (hostname) 991 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s", 992 pwd->pw_name, rtype, full_hostname, tty); 993 else 994 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s", 995 pwd->pw_name, rtype, tty); 996 if (lout) 997 sleepexit(1); 998 } 999 1000 void 1001 sleepexit(eval) 1002 int eval; 1003 { 1004 1005 (void)sleep(5); 1006 exit(eval); 1007 } 1008